Keypad structure with multi-mode display function

Abstract

A keypad structure with multi-mode display function includes: a keypad layer having a plurality of key pressing positions; and a plurality of indicating unit in installed a multilayer form and under the keypad layer, and each having a light emitting element; and a light guide element corresponding to the light emitting element. A surface of the light guide element has a symbol layer, and the symbol layer includes a plurality of symbols at the key pressing positions, such that the keypad structure can display indicating symbols of different functions at a single key pressing position.

1 . A keypad structure with multi-mode display function, comprising:
 a keypad layer, including a plurality of key pressing positions; and   a plurality of multi-layer indicating units installed under the keypad layer, each indicating unit comprising:   a light emitting element; and   a light guide element corresponding to the light emitting element, wherein a surface of the light guide element has a symbol layer, and the symbol layer has a plurality of symbols corresponding to the key pressing positions.   
   
   
       2 . The keypad structure with multi-mode display function as in  claim 1 , further comprising a polarizer, a ¼ wavelength wave-plate or a combination of the polarizer and the ¼ wavelength wave-plate installed between the keypad layer and the indicating units. 
   
   
       3 . The keypad structure with multi-mode display function as in  claim 1 , further comprising a grating unit disposed between the two adjacent indicating units. 
   
   
       4 . The keypad structure with multi-mode display function as in  claim 1 , wherein the symbol layer is a transparent ink. 
   
   
       5 . The keypad structure with multi-mode display function as in  claim 1 , wherein the light emitting element is a light emitting diode (LED) or an electro luminescent (EL) element. 
   
   
       6 . A keypad structure with multi-mode display function, comprising:
 a keypad layer, including a plurality of key pressing positions, the key pressing positions being divided into a first area of key pressing positions and a second area of key pressing positions;   a first indicating unit, disposed under the keypad layer, including:   a light emitting element;   a light guide element corresponding to the light emitting element, a surface of the light guide element having a symbol layer, and the symbol layer having a plurality of symbols corresponding to the key pressing positions;   a second indicating unit, disposed under the first indicating unit, the second indicating unit including a first indicating module and a second indicating module;   the first indicating module comprising:   a first light emitting element and   a first light guide element corresponding to the first light emitting element, a surface of the first light guide element having a first symbol layer, and the first symbol layer having a plurality of symbols corresponding to the first area of key pressing positions;   the second indicating module comprising:   a second light emitting element and   a second light guide element corresponding to the second light emitting element, a surface of the second light guide element having a second symbol layer, and the second symbol layer having a plurality of symbols corresponding to the second area of key pressing positions.   
   
   
       7 . The keypad structure with multi-mode display function as in  claim 6 , further comprising a polarizer, a ¼ wavelength wave-plate or a combination of the polarizer and the ¼ wavelength wave-plate installed between the keypad layer and the first indicating unit. 
   
   
       8 . The keypad structure with multi-mode display function as in  claim 6 , further comprising a grating unit installed between the first indicating unit and the second indicating unit. 
   
   
       9 . The keypad structure with multi-mode display function as in  claim 6 , wherein the symbol layer, the first symbol layer and the second symbol layer are transparent inks or light transflective structures. 
   
   
       10 . The keypad structure with multi-mode display function as in  claim 6 , wherein the light emitting element, the first light emitting element and the second light emitting element are light emitting diodes (LED) or electro luminescent elements.